A good negotiator knows when to play hard ball and when to give in.

一个出色的谈判家知道什么时候应该强硬，什么时候应该让步。

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And it tells other producers, Iran in particular, that the Saudis are willing to play hard ball in the rush for Asia's market share.

而且是在告诉其他产油国，尤其是伊朗，沙特愿意为争夺亚洲市场份额打一场硬仗。

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I have also witnessed a player reacting to his opponent's international and illegal blocking by deliberately hitting him with the ball as hard as he could during the course of play.

我还曾经亲眼目睹，一名球员在比赛过程中为了应对对手的全面违规封堵，故意用球狠狠打他。

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And with the rest of the G20 not in a position to play the kind of hard ball with France and Germany that Chancellor Angela Merkel and President Nicolas Sarkozy played with the Greek prime minister on Wednesday night.

BBC: The great shakedown in Cannes

Given its testy relationship with the other Gulf states, Iran has a hard time persuading them to play ball over smuggling.

ECONOMIST: Middle Eastern smugglers

But if we play at a high tempo, pass the ball quickly and work hard, they won't be able to get near us and it will be an easy night.

BBC: SPORT | Football | Internationals | Bellamy wants collective response